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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44c313fee60b2371f59d8776cb944637d921c57ec640b9ff30c9618715ca476' 
  AND token = 'zb2oQf/cAz00B0WOjMIR/866f0oRh13tT7kKoCtoJV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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