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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3427885c240ef1201d07b60fdf68102a908b7e607269a860d03d3dc04ad94c07' 
  AND token = 'b0YeplmXXgNgH2aXGORBFCy+4FQez3/AWsGhdApL/d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}