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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd179399c2f2d54edafa159c2e161e19c71f765ef43702ed85e1885cbe021018' 
  AND token = '1ECEOleXh4NCqGy9a9vr8Ljs+95s3HZDX9qq5sHp/7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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