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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925e6cb7e66386db1e73b941ac62648f30e29b306eb19b16d1bc7747dfdb423a' 
  AND token = 'tc1Q0Xq2fcsXNHEFMjGncGoIRVO0e1obPbCeKot35JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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