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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7609a337812ee20904e05aa3f94499d8d59d69821f0163ebd98da925403c8452' 
  AND token = 'nhrQeOTMZ6ZQ2puivQ3rsZvOU+yK9MQvKNvjvq9Vx70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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