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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca20a6e4904a642b26e198d65990773ac28d7a961538c14f9f52afaf8cf6c1b' 
  AND token = 'M+840SgUvHRxXFYkssiTN0yi6h8ISUAZssNAszL2Gtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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