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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4a95d8cc579fa5544479c100afe1b6aaef10271331e83cc25942a6c8f7776e' 
  AND token = 'eGqrrwvPWdapysUDAunqlB84StjKWT/S8eb0CG60Uho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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