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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0c267647a6f2107732a51d19a8c8ef92df7de79f25e57ba3d5b83cf31beae1' 
  AND token = '2tYMXcn37NCWMKj0MJ0n+D5SZEC4pPkwFMMteO9Lv9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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