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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e50ee3cb2c32e7cea0b0359647ccaa09b2edd8a4641080bedc552e82edf86fe8' 
  AND token = 'h9QwMOx/vslKJ8mDA+h/9obQFGV5S+gHqGQo8Lcu9ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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