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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '225a961d1273c0abf732b4127161dfaad026269eef306cf0d2722ae2a1588b4d' 
  AND token = '9e7rk08s5dmj/rS4o9li7FULDzuOmtnL8ViCRh2W0eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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