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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f979f2e382635df3e683b13605df957d7dde978ec961e749e631a19112f37139' 
  AND token = 'n4T4fcexEs1QBkz35TsOFZVG2n0tVr0h9aNeszN/hPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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