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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3474f99037b1b833c65a0c2a9a809d16261b81978c988ff9e395b05c22f2208' 
  AND token = 'hBPfj8wmFSjyF/A5s293Vhge+j+EWNwI+BB8MYBhg90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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