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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74cda48167fa5cb668e7fb78c69733beb6c93a7f7ba39091e38fa5dd8a82564' 
  AND token = 'mVy7jrQj/G10tETbTCXczYwj32N0Shl1b72JD1IhXAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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