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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39faa5a852a1bba6f94c3d63675bda0ec47e411781a888caf00defbb99ae4f73' 
  AND token = 'nPjrJ8e7KyM7/Kk6URXkWlw3m/f+YME3/Y2B2tYkL80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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