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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8a059399ad9825b2a09c9d968e43b73f204624ec3e3c29bad609bf07271e46' 
  AND token = 'elQcCWfeDjl21/a/t60/kNAbnTuqGSAuMy9OZk9Gi2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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