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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26377ac8335872d77ead6173df9d320053e7b8037d2c1b9380b59beadc2ead7c' 
  AND token = 'HlJol2wUnwhRU58kYZrINR7fb5GBfdauBQZy1EwQRAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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