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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a16f8758934c84d644006e263ab2f6cde75e7f5201013263d4e1f1dd06d5f59' 
  AND token = 'QHaS3z01GMcynDvZ2QbkODcSssohvhgsoJ/iW3V8f2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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