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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3028b2d6b23e61f00284ec2d0d6484f3374fa4d3868a4f899340a80584a4d60' 
  AND token = 'Eke2R422tGdv5U/oq2H6UAU6oLsE+x1Ccx9N2Ol/thE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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