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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1cff10112c95f95c9e2d1ffc4d0e64bc0931e5b4e6da0808f47077308add8d' 
  AND token = 'tLJBx7OJ9s76X4wVULkefxb5J7FLgP81zcI1rFKvT2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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