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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294bca27faf7008a64057499edef58d9987411402ea549056f88c14c9f4e7e98' 
  AND token = 'uju49IkiO+Z2iVm136y6MG3EIkRU5O1Fk0F+f7cNhbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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