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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb9901988280e7e194a875be6b10970c8a0b01bb0959ef680ed7a2172b365067' 
  AND token = 'PCauLErWV7HGcTrcOdD3NPjQhmP14Pbu36F84Bt9g/o=' 
  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"
    }
  }
}