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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe52dbeba2027faca854d1b0078bbe60c15a82e1a23f97c288161ea1634d59b' 
  AND token = 'Yd+b4WHpI+CERHcPcV0XCviIGWw1snGMeuM0MbeJ4gM=' 
  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"
    }
  }
}