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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efeb1ebf538963f0490c061c2d03b9c77703ad911a8ff2b16cc34e1535d3607' 
  AND token = 'wsKT1sODLhwwAq6FiiHpEWlqOalHLHcCvDi0k0JW6BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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