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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0387e798cde68bfd82a0e89b053f68e962f8f92d231a1e821262a7424993e2c4' 
  AND token = 'rbyRWWPvD8bnPum7+KMvozh9xIQ3tW+je9WnhKGoe3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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