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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c25c98c7090e593d93896b5d9d243c416f8c356a24bb2055e3f171a05a1d334' 
  AND token = 'M6H6v/OusPJpfZMJhXyCF+vC34anyLAek12vUXDJAcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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