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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12714eba4a8809b7e349c80b0d5291bae2ca4073f69b2ed05f1898afc1f920b7' 
  AND token = 'qFWMAASzLyj5GP553UoUekyOCBA9+vB1bHFFOwmK1CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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