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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e9e6dd2e3c5c083b964a0db5438219cf8865e7954628e7c99bd756ec3debe5' 
  AND token = '7b0QevGKMNBkkIuwMMe6ZRQoK3hX+z8OmzY/zWAh+ow=' 
  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"
    }
  }
}