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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebd4be3c993e24652d3eb870d2d2d1b6e3cbfeb801c575df79ccea0322e7109' 
  AND token = '0UfBffvMLlnYFGxN4/Lw4n5FmRNNV3ggw7Sp3GN/J2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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