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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23ac9bb84dcfc62e88c7530a91571d4a82f0bf04c387281ce13e0e327e07e9b' 
  AND token = 'PiHC0uqDBB6keKlpJAWeYBykSzCnMJYEpfK/d9w4XjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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