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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e28a534f86443f06efb478b39d6a034332450d8c9cacdd5467789d63d18b2f' 
  AND token = 'QhrullKn7ObRUSakllERJrbp/m1oqSZrMu6cJyqf+qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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