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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8553f373b4cc2fb98d3b981dc12f32c9d484e38d34f04d759499b1f0633dd11e' 
  AND token = 'a1VmnaNKI2tl33DtpO617F0Yfc309E9MjhYckjz+RBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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