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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e5ba90f04e8fa265b02d16b025b6a71074f74e6529d65fd799b5da2e804eeaf' 
  AND token = 'JBlyj+06efGjt+dhIMbzcP5wCARiUkkZh+eDt14L0kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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