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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad10b3e797c78024aaba48612ebb5aacb54dfd8fb7c48582b5492c8712b24a5' 
  AND token = '7Fw8uw+Vvpjg0g8CuR/oEba2x2SRN8pCF8NY0LZL4Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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