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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9075c18b0e480b896fa75f96e18e21caa3539034a51527c6a40a11d03bf7848a' 
  AND token = 'hcvcmmtV2cCt9R2vPC4E5Cq5qwgruEcyY2tYOK4/3Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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