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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26be49cfeb595d0e4af269430991a645191bdb766a143b3d92732f0d1582a7ed' 
  AND token = 'HN6N32oqTz1h4gQNmWPsSw6FZeOUP/dWdBaVBW+KX4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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