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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b021c784090d3e9f99f7a81d8f118fe25b4ebcb939e22f68f3831235176dbd' 
  AND token = 'ktU63JjqJpmys2xx50MArs5GBVfCKal4s6lTPSYXPyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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