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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c14041c7f79f7fd7b33d7bc18d516af89a1240c5eb1c07314a5340372c6a950' 
  AND token = '3Rt5uN36jt5eXPmMiitaizY/Uxs4YAhZXttU3B5hLCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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