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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b21dc07e9387b4d1716439fdb58b87a42543eed2e11accfe78b7b909b3009a3a' 
  AND token = '7Rs/m9u9s0sXAlmHJ8lHaxtI4GT+j5lV18ppGcyqZyA=' 
  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"
    }
  }
}