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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '727bc264ced1f3070843e0af8a69c0d45f9d44681ee12f7e96667e14165d0e71' 
  AND token = '3MGNCZ4Zi8x0AUyWmKYqje/RR7VK9qM+VWEuI7QmMS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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