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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8e04e1aca0b038bfd93c1a5ca559636d96c27b4dd08490d8a7700443dcc3b8' 
  AND token = '8Lvi/hxvf2FMj4XcFXJ/izLRAvgjQ39tofKB+0UcfjQ=' 
  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"
    }
  }
}