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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbb1d405e57972e7810c2a3163e0a4ea32d5d7ef0b51cbbcb8407b03c22d979' 
  AND token = 'EYLtZG3nVj0qwUCSSPT/7sC39gJY9YjjWrU/10bgYrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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