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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0562890c691acb40d49657a1994b0b189db58e5075152d8ce1d3775fb874897' 
  AND token = 'aptgEhbytcrFCoqxnxEPlauTmMDYo5iV/kSauu9Jkqk=' 
  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"
    }
  }
}