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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70619bff75166637b3fb259d08e0653dd746e1d1d22d31788b94c8bda8e4950b' 
  AND token = 'grk7m+f6T7d9aDP156VG1gKVQ3Pffj/9+XeRkaS5eJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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