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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca047532aeaa6cd4d0cc44bee41c63687ba6f00f5a1d8a221a75041b46de835b' 
  AND token = 'eQbITyJnXJ+99AxUAZ4YsFXlCfHeCq3Gt5j08azAySE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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