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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4f4673eff5911127bb6d2bf12633211ae65bf2cd630a480acee7f836bf1c73' 
  AND token = 'NYn3sGl2WL5W+WSM4D7IpDi1WzC58eg8AUeXz6aC1Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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