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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95286c87cc634385607cbc3c7c6b6a6492bec1d571e1c246201586160eb3f90c' 
  AND token = 'BiLcHaQvaZA+S0xWcCM/IO2NGA7rwWfQS9mptBSvqVA=' 
  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"
    }
  }
}