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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ebe804151201fcb29045a57b93d2c1f8afe615f1b676dfeef2afdca3c3944b' 
  AND token = 'KzpS9OqakJY8ul4T0IjFz0HL2aZXvR75B6kb2iu3fMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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