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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92aff4a12509aa909b1d4a7e140a259e355c8cc6b3205cf6b4aba9ea61534fe1' 
  AND token = 'lPPhPJ/ENXaX7iDz2cw51/3FaX/r7dUg0vDjr02vzL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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