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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb8acd21a17fbd6448cd59188a1ba0524efd40ed539d8c97a75236ef1a89aa6' 
  AND token = '1VAmJp8MpsSD1GTqBh0TlINMcXC+HRqcMvgRdm8uDcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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