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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82fead2a025b8c7371fa426510578944123d4712e989c6ba665f485c9086d2c2' 
  AND token = 'ztK9QQ2ww0Sb4JwaHhoNi3221jPZTc9I5vl8TpiPXds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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