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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4be57acb8dab4eabf64613b5ad61edfdd3e8e8e75f2e36dbee2cd01929978d' 
  AND token = 'i43mkdeKFq/4cFW+chaRE3y+uvgORyyYGC2N5PPqWgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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