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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d6b0250d536c83462fd401c8d8fb42f18bd3ce4b5b14a3c01649b2cc4ea827' 
  AND token = '4U9nAJfKMCJXBhWQC8xrk7e8g2D6jOCeFfmFLYultCM=' 
  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"
    }
  }
}