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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c11267d0f2f9c279e28029ccacdb993afd5c71c9fe9325551b194a2a7ab6c2' 
  AND token = 'bfu67r1MS/mqP5BvkXPH8/FGdhyMy9Kn0Adr1EHAig8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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