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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4545627ef634fe6a3da11da744ae8e485624571a5753a3d9f8e99c9713516409' 
  AND token = 'M0dn+WOnZRRjcYLc/IopuZZDz7hjNuSKnenqb8eUT74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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