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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f72015d3ad8561cb9174632841db8c20e6ee9f24c5e57f3d361d8321d022c6' 
  AND token = 'zz6qf2+jO0ID5lBQDmdf6YScOk0pRxCytaT84R3ATVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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