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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec23fe0158f1846039762c4c775f9d458c7d558fa0e53f3a8b2c7fe3238add24' 
  AND token = 'WaaMWkxn/R+i3QPDLJ/q2rcspST2pZGJZ3AMTkzzu8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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