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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea60b77750767ffd1cf87eedfd824825b942ccc8f7fe4616b4c9be45e6746fb8' 
  AND token = 'lqfMl9gwqU1/SekepehzEy4qA97P18OMYNetb1kzNzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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